"clebert.suconic(a)jboss.com" wrote : If I understand correctly, you need to set slowConsumer=true on the ConnectionFactory used by the MDB. You probably don't want any buffer on the client, as you want the message to be round robbed to other servers. | | | It' s a bit obscure what you are trying to achieve here.. so I' m suggesting that based on what I understood. You seem to understand what I'm trying to do. I want maximum throughput of whatever the MDB is doing while honoring the requirements that only one thread can enter the MDB onMessage at a time. Messages should not wait for a MDB that's busy. If it's busy, it should go another MDB that is not busy. If all MDBs are busy, it should wait until one isn't busy. Very simple. I will try the slowConsumer thing to see if it works. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4247361#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...